Answer
$\cos^2 x$
Work Step by Step
Using the known identities: $\frac{\sin(\pi/2-x)}{\sec x}=\frac{\cos x}{\frac{1}{\cos x}}=\cos^2 x$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - Chapter Test - Page 969: 9
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